|Year|Competition|Venue|Position|Event|Notes|
|---|---|---|---|---|---|
|2001|Beijing Marathon|Beijing, PR China|7th|Marathon|2:10:46|
|2002|Beijing Marathon|Beijing, PR China|1st|Marathon|2:13:09|
|2004|Olympic Games|Athens, Greece|31st|Marathon|2:19:26|
|2007|Xiamen International Marathon|Xiamen, PR China|1st|Marathon|2:13:17|
|2007|World Championships|Osaka, Japan|43rd|Marathon|2:32:44|
|2008|Olympic Games|Beijing, PR China|51st|Marathon|2:24:08|

Question: how many marathons were held in beijing?
Answer: 3